Vista Energy, S.A.B. de C.V.

We have adopted a code of ethics and conduct (“Code of Ethics and Conduct”) that applies to all Vista officers and employees, as well as to third parties, including contractors, suppliers and business partners, that interact with Vista. The Code of Ethics and Conduct is available on our website at: www.vistaenergy.com. We did not modify or amend our Code of Ethics and Conduct during the year ended December 31, 2025, nor did we grant any waivers thereunder during such period.

Our Code of Ethics and Conduct sets forth the principles and standards that govern the manner in which we conduct our businesses. It is designed to promote compliance with applicable laws and regulations, foster mutual respect in the workplace, and ensure that we act with integrity and transparency in the market. Our Code of Ethics and Conduct expressly sets forth, among other matters, that no person shall, on behalf of Vista, directly or indirectly, including through third parties, offer or provide anything of value to a public officer, or to their representatives, for the purpose of obtaining or maintaining a business, influencing business decisions, or receiving any improper or unfair advantage.

Additionally, Vista’s commitment to ethical business conduct includes the obligation to maintain accurate and complete accounting books, financial statements and accounting records. Our accounting records, including our financial statements, management reports, contracts and agreements, must accurately and fairly reflect our economic activities and transactions, in accordance with applicable accounting standards and the laws governing Vista. All of Vista’s transactions, regardless of their amount, must be properly authorized, executed and recorded. In the event of a violation of the Code of Ethics and Conduct, the Company shall take appropriate disciplinary measures.

Contractors, suppliers, and other business partners are required, as a condition for onboarding and registration in Vista’s systems, to adhere to the Integrity Policy for Contractors and Suppliers, which is aligned with our Code of Ethics and Conduct and establishes the ethical principles applicable to third parties performing activities on behalf of the Company.

Moreover, Vista provides a confidential, secure and accessible reporting channel to employees and third parties (the “Ethics Line”). The Ethics Line is operated by an independent third-party provider and allows reports to be submitted anonymously. All reports received through the Ethics Line are reviewed and assessed by the Ethics Committee, which is composed by the members of the Executive Team and the General Counsel, in accordance with the Company’s Procedure for Code Violations. Vista strictly prohibits any form of retaliation against individuals who report concerns in good faith.